Analysis of Advantages and Disadvantages of Side-in Backlight and Discussion on Improvement Methods

by:Kimeery     2021-09-01
The side-type LED backlight is a kind of backlight product commonly used by our company, and it is also one of the two most widely used LED backlights in the backlight, just like the direct-type LED backlight. Here Xingyuhe Electronics will do a unified analysis of the characteristics of the edge-type LED backlight, where are the advantages and disadvantages, and what can be improved. Analysis of the advantages and disadvantages of the side-mounted LED backlight module. Advantages 1. It can use fewer LED dies and save costs. 2. It can build a thinner and lighter body, so that the rear of the LED TV LCD panel does not need to be equipped with an LED module, but Place it on the side to reduce the overall thickness of the screen, creating a thinner model than direct-lit LED-backlit LCD TVs. Disadvantages 1. The coupling efficiency of the LED package and the light guide plate can be improved; 2. It is challenging when applied to large sizes; 3. Local control cannot be performed. 4. The structure of the traditional side-type LED backlight module The structure of the traditional side-type LED backlight module The structure of the traditional side-type LED backlight module includes the LED light source arranged on the side of the light guide plate and the bottom surface of the light guide plate To form dots. The light emitted by the LED package is coupled into the light guide plate, and propagates toward the mobile LCDscreen screen through the reflection and scattering of the reflective sheet and the dots. Structural shortcomings For the traditional edge-type LED backlight module, the light emitted by the LED chip cannot enter the light guide plate. On the one hand, part of the light (large-angle light, about 20%-30%, depends on Package structure) cannot be emitted from the light-emitting surface of the LED package due to total internal reflection. On the other hand, even if the light has been emitted from the light emitting surface of the LED package, part of the light cannot enter the light guide plate due to the reflection of the light incident surface of the light guide plate, as shown in FIG. 1. The coupling method and efficiency between the LED package and the light guide plate need to be further improved. Figure 1 Cross-sectional view of side-type LED backlight improvement method 1. Improve the coupling efficiency between the LED package and the light guide plate In order to make all the light emitted by the LED chip enter the light guide plate, transparent glue 210 is used to stick the light-emitting surface of the LED package 102 on The light incident surface of the light guide plate is shown in Figure 2. Since the refractive index of the silica gel, transparent glue, and light guide plate of the LED package is basically the same, there is basically no total internal reflection at the light exit surface of the LED package, and the light enters the light guide plate. There is basically no reflection on the surface. The light emitted by the LED chip basically enters the light guide plate, and the coupling efficiency is improved, basically reaching 100%. In addition, because there is no total internal reflection, the large-angle light emitted by the LED chip also enters the light guide plate. It is easy to achieve the uniformity of brightness. Figure 2 Advantages of the improved cross-sectional view: (1) The coupling efficiency between the LED package and the light guide plate is improved. (2) The light output efficiency of the LED package is increased by about 20%-30%. (3) The heat generated by each LED package is reduced by about 8%-13%. (4) The number of LED packages used while ensuring the same brightness About 16%-23% reduction, reducing costs. (5) The total heat generated by the LED backlight module is reduced by approximately 23%-33%. (6) Energy consumption is reduced by approximately 16%-23%. (7) The light output angle of the LED package is increased. 2. Suitable for large-size TVs with V-groove light guide plate The side-entry LED backlight module with V-groove light guide plate enables LED backlight to be applied to any large-size display screen without the need for higher brightness LED chip. A V-shaped groove 402 is formed in the middle part of the top of the light guide plate 401, and an LED light source 408b is arranged at the position corresponding to the V-shaped groove at the bottom of the light guide plate. Reflect, so as to spread to the side of the light guide plate, as shown in Figures 3a and 3b. The LED light source is glued to the bottom of the light guide plate to increase the light extraction efficiency. Fig. 3a is a top view. Fig. 3b is a cross-sectional view. Fig. 3c shows an embodiment in which the V-shaped grooves 402a, 402b and 402c are arranged in a cross shape, which can be used for a large-size backlight. Fig. 3c is a top view. Fig. 3d shows a schematic diagram of the embodiment of Fig. 3c. Figure 3d schematic diagram improved advantages: (1) suitable for any large-size display. (2) Thinning. The thickness of the SMD LED package can be 0.7mm, and the PCB thickness can be 1mm. Therefore, the thickness of the LED backlight module is only 1.7mm more than the thickness of the traditional edge-type LED backlight module. (3) LED package The light extraction efficiency is high. (4) Better heat dissipation. (5) The light-emitting angle of the LED package is increased. 3. To reduce the number of LED packages used, the side-lit LED backlight module without light guide plate is an embodiment of the side-lit LED backlight module without light guide plate: an LED light source 205 is arranged on one side, and the opposite side is a side reflector. 204b, forming dots 203 on the main reflective sheet 204a and the side reflective sheet 204b, adjusting the structure and distribution of the dots to make the brightness distribution uniform, Figure 4a Figure 4a cross-sectional view Figure 4b shows the LED light sources 405a and 405b are arranged on both sides, and are inclined At an angle 409. Dots 403 are formed on the main reflector 404. The advantages of the improved cross-sectional view of Fig. 4b: (1) There is no light guide plate and light attenuation in the light guide plate, therefore, the number of LED packages used is reduced. (2) Reduce the heat generated. (3) Reduce costs. (4) Reduce weight. Although there are many shortcomings in the edge-type LED backlight, it cannot prevent it from becoming the most commonly used LED backlight. It is also because of its cost and size advantages. If the above-mentioned improvements can be used to overcome or reduce the edge-type LED The disadvantages of the backlight module have a negative impact on its performance, and the market space it possesses will be broader. For related products, please click LED backlight
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